A 1 kA-class cryogen-free critical current characterization system for superconducting coated conductors
A 1 kA-class cryogen-free critical current characterization system for superconducting coated conductors
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DOI：
10.1063/1.4902139
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发表时间：
2014-11-01
影响因子：
1.6
通讯作者：
Wimbush, S. C.
中科院分区：
文献类型：
--
作者：
Strickland, N. M.;Hoffmann, C.;Wimbush, S. C.
介绍了一种低温电输运测量系统，该系统是专门为满足基于YBa2Cu3O7涂层导体形式的商用第二代高温超导（HTS）导线的常规和有效表征而设计的。具体设计参数包括基准温度为20 K，应用磁场能力为8 T（由高温超导分圈磁铁提供），测量电流容量接近1 kA。该系统可容纳宽度达12毫米的样品（目前市售的最宽导体尺寸）和40毫米长的样品，尽管这不是一个限制尺寸。样品能够在与电流平行的轴上相对于磁场方向自由旋转，在标准最大洛伦兹力配置中产生场角变化。该系统完全没有用于样品冷却和磁铁冷却和操作的液态冷冻剂。软件使系统能够在没有任何用户交互的情况下对样品的临界电流的温度、磁场和场角依赖进行全面表征。该系统已成功用于测量来自不同制造商的各种实验和商用超导线样品，涵盖了各种操作条件。该系统封装了高温超导磁体设计和高效无低温冷却技术的重大进步，以及在低温下进行常规和自动化大电流电输运测量的能力。对于研究超导体行为的科学家和寻求在所有期望的操作条件下准确表征其产品性能的商业电线制造商来说，这将是一个有趣的问题。(C) 2014 AIP出版有限责任公司
A cryogenic electrical transport measurement system is described that is particularly designed to meet the requirements for routine and effective characterization of commercial second generation high-temperature superconducting (HTS) wires in the form of coated conductors based on YBa2Cu3O7. Specific design parameters include a base temperature of 20 K, an applied magnetic field capability of 8 T (provided by a HTS split-coil magnet), and a measurement current capacity approaching 1 kA. The system accommodates samples up to 12 mm in width (the widest conductor size presently commercially available) and 40 mm long, although this is not a limiting size. The sample is able to be rotated freely with respect to the magnetic field direction about an axis parallel to the current flow, producing field angle variations in the standard maximum Lorentz force configuration. The system is completely free of liquid cryogens for both sample cooling and magnet cool-down and operation. Software enables the system to conduct a full characterization of the temperature, magnetic field, and field angle dependence of the critical current of a sample without any user interaction. The system has successfully been used to measure a wide range of experimental and commercially-available superconducting wire samples sourced from different manufacturers across the full range of operating conditions. The system encapsulates significant advances in HTS magnet design and efficient cryogen-free cooling technologies together with the capability for routine and automated high-current electrical transport measurements at cryogenic temperatures. It will be of interest to both research scientists investigating superconductor behavior and commercial wire manufacturers seeking to accurately characterize the performance of their product under all desired operating conditions. (C) 2014 AIP Publishing LLC.